<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
<!--    插值-->
  <h1>{{info}}</h1>
</div>

<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>

<script>
let v = new Vue({
    <!--  设置管理范围-->
  el:"body>div",
  data:{
    //    对其监听
    info:"Hello Vue!"
  }
})
</script>
</body>
</html>